scholarly journals Evaluation of Green Elements and Thermal Comfort Condition of Assyafaah Mosque, Singapore

2021 ◽  
Vol 8 (2) ◽  
pp. 913-934
Author(s):  
Noor Muhammad Abdul Rahman ◽  
Muhammad Syukri Imran Abdullah ◽  
Chin Haw Lim
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Energy Use ◽  
Religious Activities ◽  
Humid Climate ◽  
Thermal Discomfort ◽  
Cultural Aspects ◽  
Passive Design ◽  
Passive Strategies ◽  
The Impact

A mosque is a place for worship and religious activities that are traditionally built with a typical design and shape with a dome and minaret as its traditional symbols. The most basic design of a mosque is a simple single-storey rectangular-shaped building with a prayer hall inside it. Design in the past was influenced by social and cultural aspects. However, regional and climatic differences have led to thermal discomfort and unnecessary energy use if the mosque is not properly designed. Therefore, there is a need to consider comprehensive planning and review for passive design to avoid thermal discomfort and excessive use of energy. Assyafaah Mosque in Singapore is one example that considers sustainable elements in its design. While Singapore is located very near to the hot equatorial line, many passive and green features have been integrated into the design and construction of the mosque, and this made it possible to achieve an acceptable thermal condition according to the adaptive and PMV thermal comfort model. The design maximizes the potential of naturally ventilated design with other passive strategies which allow for both thermal comfort and energy saving. This paper aims to study the impact of natural ventilation and other passive design decisions on the thermal comfort of the Assyafaah mosque in a hot and humid climate.

scholarly journals The assesment of thermal comfort of sustainable modifying Rumoh Aceh in hot humid climate

2021 ◽  
Vol 881 (1) ◽  
pp. 012052
Author(s):  
E Meutia ◽  
E N Rauzi ◽  
Z Sahputra ◽  
D Maryana
Keyword(s):  
Thermal Comfort ◽  
Energy Use ◽  
Thermal Environment ◽  
Passive Cooling ◽  
Humid Climate ◽  
Traditional Architecture ◽  
Sense Of Satisfaction ◽  
Hot Humid Climate ◽  
The Tropics ◽  
The Impact

Abstract The climates of countries in the tropics tend to have high temperatures and humidity, and intense solar insulation. This condition gives the impact of discomfort for humans who are in the building. Implementing a passive cooling strategy can reduce energy use. Traditional architecture is one of the buildings that has been believed to apply natural cooling as a passive cooling design strategy. Based on several previous studies on the application of passive designs to obtain thermal comfort in the room, this study was conducted to assess the thermal comfort of Modifying Rumoh Aceh, which has not been widely studied. This study uses a direct measurement method in the field using an anemometer to measure temperature and airflow velocity. An Infrared/Thermometer Gun is also used to measure the surface temperature of materials (walls, roofs, and floors). Using the Climate Consultant Software to obtain annual climate condition data, AndrewMarsh 3-D Sunpath was also used to assess the orientation of buildings. Measurements were carried out for 3 days on 15 samples of Modifying Rumoh Aceh in Gampong Jawa, Kutaraja sub-district, Banda Aceh. The results obtained indicate an increase in room temperature by 7ºC from the standard comfort temperature based on SNI. The human ability to adapt to the environment can be seen in the perception of the Gampong Jawa community in accepting changes in the thermal environment by 47% with a sense of satisfaction. However, further research is needed to obtain a value for the level of satisfaction of the thermal environment in the tropics area.

scholarly journals Proposing Alternative Solutions to Enhance Natural Ventilation Rates in Residential Buildings in the Cfa Climate Zone of Rasht

2021 ◽  
Vol 13 (2) ◽  
pp. 679
Author(s):  
Roya Aeinehvand ◽  
Amiraslan Darvish ◽  
Abdollah Baghaei Daemei ◽  
Shima Barati ◽  
Asma Jamali ◽  
...  
Keyword(s):  
Natural Ventilation ◽  
Residential Buildings ◽  
Residential Building ◽  
Ventilation Rate ◽  
Humid Climate ◽  
The Sustainable Development ◽  
Passive Strategies ◽  
Development Goals ◽  
Ventilation Rates ◽  
Ventilation Systems

Today, renewable resources and the crucial role of passive strategies in energy efficiency in the building sector toward the sustainable development goals are more indispensable than ever. Natural ventilation has traditionally been considered as one of the most fundamental techniques to decrease energy usage by building dwellers and designers. The main purpose of the present study is to enhance the natural ventilation rates in an existing six-story residential building situated in the humid climate of Rasht during the summertime. On this basis, two types of ventilation systems, the Double-Skin Facade Twin Face System (DSF-TFS) and Single-Sided Wind Tower (SSWT), were simulated through DesignBuilder version 4.5. Then, two types of additional ventilation systems were proposed in order to accelerate the airflow, including four-sided as well as multi-opening wind towers. The wind foldable directions were at about 45 degrees (northwest to southeast). The simulation results show that SSWT could have a better performance than the aforementioned systems by about 38%. Therefore, the multi-opening system was able to enhance the ventilation rate by approximately 10% during the summertime.

scholarly journals Building and Urban Cooling Performance Indexes of Wetted and Green Roofs—A Case Study under Current and Future Climates

Energies ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 6192
Author(s):  
Madi Kaboré ◽  
Emmanuel Bozonnet ◽  
Patrick Salagnac
Keyword(s):  
Thermal Comfort ◽  
Emission Scenario ◽  
Green Roof ◽  
Heat Fluxes ◽  
Temperate Climate ◽  
Passive Cooling ◽  
Thermal Discomfort ◽  
Indoor Thermal Comfort ◽  
Performance Indexes ◽  
The Impact

We developed and studied key performance indexes and representations of energy simulation heat fluxes to evaluate the performance of the evaporative cooling process as a passive cooling technique for a commercial building typology. These performance indexes, related to indoor thermal comfort, energy consumption and their interactions with their surrounding environments, contribute to understanding the interactions between the urban climate and building for passive cooling integration. We compare the performance indexes for current and future climates (2080), according to the highest emission scenario A2 of the Special Report on Emission Scenario (SRES). Specific building models were adapted with both green roof and wetted roof techniques. The results show that summer thermal discomfort will increase due to climate change and could become as problematic as winter thermal discomfort in a temperate climate. Thanks to evapotranspiration phenomena, the sensible heat contribution of the building to the urban heat island (UHI) is reduced for both current and future climates with a green roof. The performance of the vegetative roof is related to the water content of the substrate. For wetted roofs, the impacts on heat transferred to the surrounding environment are higher for a Mediterranean climate (Marseille), which is warmer and drier than the Paris climate studied (current and future climates). The impact on indoor thermal comfort depends on building insulation, as demonstrated by parametric studies, with higher effects for wetted roofs.

Optimal Minimum Airflow for Air Circulation of Single-Duct VAV Terminal Boxes

2008 ◽  
Author(s):  
Young-Hum Cho ◽  
Mingsheng Liu
Keyword(s):  
Thermal Comfort ◽  
Air Temperature ◽  
Thermal Discomfort ◽  
Variable Air Volume ◽  
Air Handling Unit ◽  
Optimal Value ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Air Circulation ◽  
The Impact

Thermal comfort in an area is directly controlled by terminal boxes in variable air volume (VAV) air-handling unit (AHU) systems. The terminal box either modulates airflow or adjusts the discharge air temperature. Reduced air circulation will cause thermal discomfort in a conditioned space if the airflow and discharge air temperature are not suitable. The objective of this study is to identify an optimal value for airflow and discharge air temperature that will maintain room thermal comfort. Optimal room airflow and discharge air temperature is analyzed, and the impact of room airflow and discharge air temperature on thermal stratification is verified through CFD (Computational Fluid Dynamics) simulations.

Assessment of Different Natural Ventilation Strategies for an Educational Building on the Warm-Humid Climate of Guayaquil, Ecuador

2015 ◽  
Author(s):  
R. David Beltrán ◽  
Juan Kastillo ◽  
Isabel Miño-Rodríguez ◽  
Carlos Naranjo-Mendoza ◽  
Carlos Ávila
Keyword(s):  
Energy Consumption ◽  
Natural Ventilation ◽  
Energy Savings ◽  
Main Concern ◽  
Humid Climate ◽  
The Real ◽  
Ventilation Strategies ◽  
Definition Of ◽  
The Impact ◽  
Real State

Natural ventilation has been studied as an effective strategy in order to reduce energy consumption without compromising occupant’s hygrothermal comfort in warm-humid climates. However, the main concern about the current state of art in the use of Building Energy Simulation (BES) as an approach to natural ventilation is the definition of input data which usually do not represent the real state of the buildings in the studied region. Within this context, the main contribution of this research is to propose a methodology through which the real state of buildings can be evaluated. By this analysis, valid input parameters was found to exploit the capabilities of BES and CFD simulations to fulfill the main objective of this study, which is to assess the impact of natural ventilation strategies in the energy consumption of HVAC systems and occupants hygrothermal comfort. Four natural ventilation strategies were evaluated: single sided ventilation, cross ventilation, solar chimney and double façade. The results show that the exclusive use of natural ventilation is ineffective to ensure hygrothermal comfort in a building with high thermal loads in a warm-humid climate like Guayaquil. However, by using a hybrid system (natural ventilation/dehumidification and cooling) cooling energy consumption can be reduced in up to 10.6% without compromising occupant’s hygrothermal comfort. Due to the promising results regarding energy savings, further research will aim to evaluate the impact of other passive strategies in energy consumption.

scholarly journals An Investigation on Indoor Temperature of Modern Double Storey House with Adapted Common Passive Design Strategies of Malay Traditional House

2021 ◽  
Vol 29 (2) ◽  
Author(s):  
Maryam Qays Oleiwi ◽  
Mohd Farid Mohamed
Keyword(s):  
Thermal Comfort ◽  
Natural Ventilation ◽  
Building Envelope ◽  
Simulation Software ◽  
Passive Cooling ◽  
Design Strategies ◽  
Housing Type ◽  
Humid Climate ◽  
Cooling Strategies ◽  
Hot Humid Climate

Past years have witnessed the popularity of traditional Malay house as a common housing type in Malaysia. However, double-storey house has become one of the common types of low-rise housing in Malaysia. Several passive cooling strategies have been adopted to cope with the hot-humid climate of Malaysia. In this study, the thermal comfort of a double-storey house was examined when different passive cooling strategies that were adopted from traditional Malay houses were applied using IES-VE 2019 building simulation software. The simulation was conducted for various design strategies such as changing concrete roof tiles to clay roof tiles, adding two small openings to the attic, removing the ceiling between the upper floor and the attic, and extending the overhang by 50% of its length for all the four facades. All these strategies were tested and compared between full-day natural ventilation and without any ventilation. The thermal comfort of these strategies was graphically defined based on the operative temperature. These analyses revealed that protecting the building envelope by extending the overhang by 50% of its length for all the four facades could ensure the best thermal comfort is achieved compared to other selected strategies. Recommendations for further studies are also outlined in this paper.

scholarly journals Evaluating the Perception of Ventilation for Thermal Comfort in Senate Buildings: A Case of Nigeria Universities

2018 ◽  
Vol 9 (1) ◽  
pp. 1-9
Author(s):  
Ayeni Conqueror A. ◽  
Ayinla A. Kunle ◽  
Ajayi Oluwole
Keyword(s):  
Thermal Comfort ◽  
Direct Observation ◽  
Natural Ventilation ◽  
Physical Characteristics ◽  
Office Buildings ◽  
Thermal Discomfort ◽  
South West ◽  
Survey Results ◽  
Major Factors ◽  
Window Condition

Window condition is one of the major factors of ventilation in office buildings. The study aimed at evaluating the natural ventilation in Senate buildings of selected Universities in South-West Nigeria. The study employed the use of questionnaires survey to solicit information on subjective feelings of the occupants on the effects of thermal opening and thermal comfort in Senate buildings offices. Direct observation was carried out to obtain information on the physical characteristics of the selected buildings. Limited research has been recorded on the study of occupants’ feelings in buildings in relation to openings in buildings. Based on the survey results, it was found that 34.0% of the windows were casement type, 30.0 % were projected 25.5% were sliding; while 9.5% were the louvred type. The study showed that 73.8% of the respondents preferred the casement window type because of its easiness in operation to other window types and improved thermal comfort on occupants. The study concluded that with adequate sizes, casement window type is the best in ameliorating the effect of thermal discomfort in Senate Buildings.  

scholarly journals DESEMPENHO TÉRMICO DE UMA EDIFICAÇÃO UNIFAMILIAR NATURALMENTE VENTILADA PARA O CLIMA DE TEÓFILO OTONI-MG

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Camila Cordeiro de Oliveira ◽  
Nayara Rodrigues Marques Sakiyama ◽  
Layane Ventura de Miranda
Keyword(s):  
Energy Efficient ◽  
Architectural Design ◽  
Natural Ventilation ◽  
Climate Data ◽  
Single Family ◽  
Humid Climate ◽  
Thermal Discomfort ◽  
The Hours ◽  
Efficient Construction ◽  
The City

RESUMO: Nos últimos anos, em virtude das preocupações com a eficiência energética das edificações, a adequação da arquitetura ao clima ganhou maior importância. Sendo que, uma das formas de tornar uma construção eficiente energeticamente, é através da utilização de estratégias de condicionamento passivo, destacando-se a ventilação natural para o clima quente e úmido. Neste contexto, o presente trabalho apresenta a simulação computacional de uma edificação unifamiliar, naturalmente ventilada, realizada por meio do plug-in Archsim, para a cidade de Teófilo Otoni – MG, utilizando-se, para tanto, os dados climáticos do TRY (Test Reference Year). As alternativas adotadas nas simulações consistiram em variar a disposição e a área de ventilação das aberturas, verificando a influência destes parâmetros no desempenho térmico da edificação. De acordo com os resultados obtidos na simulação pode-se dizer que a melhor orientação para as aberturas é na direção leste-sul com área de abertura para ventilação natural de 20% da área do piso. Para esta composição a porcentagem de horas de conforto para a edificação é de 57,5% e o desconforto térmico anual é de 42,5% das horas. A principal contribuição deste artigo consiste na análise da utilização da ventilação natural em edificações de pequeno porte e seu impacto no conforto térmico do usuário, apresentando ainda a importância da utilização de simulações computacionais como ferramenta de auxilio no projeto arquitetônico.
 
 ABSTRACT: Concerns related to energy efficiency in buildings in recent years, induced the increase of architectural adaptation to climate. The use of passive conditioning strategies, emphasizing natural ventilation for hot and humid climate is one way to have an energy-efficient construction. In this context, this paper presents a computer simulation of a single family building, naturally ventilated, held by the plug-in Archsim to the city of Teófilo Otoni - MG, using the climate data TRY (Test Reference Year). The alternative adopted in the simulations consisted in varying the layout and area of ventilation openings, checking the influence of these parameters on the thermal performance of the building. According to the results obtained in the simulation, the best orientation for the openings is in the south-east direction with opening area for natural ventilation of 20% of the floor area. For this composition the building comfort hours’ percentage is 57.5% and the annual thermal discomfort is 42.5% of the hours. The main contribution of this paper is the analysis of the use of natural ventilation in small buildings and its impact on the thermal comfort of the user, showing the importance of using computer simulations as an aid tool in architectural design.

scholarly journals Impact of the Design of Walls Made of Compressed Earth Blocks on the Thermal Comfort of Housing in Hot Climate

Buildings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 157 ◽  
Author(s):  
Césaire Hema ◽  
Adamah Messan ◽  
Abdou Lawane ◽  
Geoffrey Van Moeseke
Keyword(s):  
Thermal Comfort ◽  
Inside Surface ◽  
Living Room ◽  
Thermal Discomfort ◽  
Hot Climate ◽  
Compressed Earth Blocks ◽  
Concrete Blocks ◽  
Earth Blocks ◽  
Annual Reduction ◽  
The Impact

This study investigated the impact of the design of wall systems, mainly made of compressed earth blocks (CEB), on the indoor thermal comfort of naturally ventilated housing in hot climates of Burkina Faso. Conventional housing was modeled and calibrated using the WUFI® Plus dynamic simulation tool based on typical field surveys and the literature. This allowed testing the ability of different wall designs to impact thermal comfort. Thermal discomfort was assessed through an adaptive approach and was based on the annual weighted exceedance hours of overheating. Six designs of walls made of CEB and other locally available materials were simulated and compared to those made of classical hollow concrete blocks. The results of the simulation reveal that the profiles of thermal discomfort vary depending on the wall designs and building spaces. Thus, the wall made, from the outside toward the inside surface, of plywood of 2 cm, an insulation layer of 5 cm and a CEB layer of 29 cm thickness is the most suitable for an annual reduction in overheating for the living room. Regarding the bedroom, the most suitable wall is made of a 14 cm CEB layer, 5 cm insulating layer and 2 cm wood layer from the outside toward the inside surface.

scholarly journals Sensitivity Analysis of Passive Design Strategies for Residential Buildings in Cold Semi-Arid Climates

2020 ◽  
Vol 12 (3) ◽  
pp. 1091 ◽  
Author(s):  
Waqas Ahmed Mahar ◽  
Griet Verbeeck ◽  
Sigrid Reiter ◽  
Shady Attia
Keyword(s):  
Sensitivity Analysis ◽  
Thermal Comfort ◽  
Residential Buildings ◽  
Design Parameters ◽  
Rapid Urbanization ◽  
Design Recommendations ◽  
Adaptive Comfort ◽  
Passive Design ◽  
The Impact ◽  
Semi Arid

Buildings are significant drivers of greenhouse gas emissions and energy consumption. Improving the thermal comfort of occupants in free-running buildings and avoiding active and fossil fuel-based systems is the main challenge in many cities worldwide. However, the impacts of passive design measures on thermal comfort in cold semi-arid regions are seldom studied. With the rapid urbanization and the widespread use of personalised heating and cooling systems, there is a need to inform building designers and city authorities about passive design measures that can achieve nearly optimal conditions. Therefore, in this study, a global sensitivity analysis of the impact of passive design parameters on adaptive comfort in cold semi-arid climates was conducted. A representative residential building was simulated and calibrated in Quetta, Pakistan, to identify key design parameters for optimal thermal comfort. The results list and rank a set of passive design recommendations that can be used widely in similar climates. The results show that among the investigated 21 design variables, the insulation type of roof is the most influential design variable. Overall, the sensitivity analysis yielded new quantitative and qualitative knowledge about the passive design of buildings with personalised heating systems, but the used sensitivity analysis has some limitations. Finally, this study provides evidence-based and informed design recommendations that can serve architects and homeowners to integrate passive design measures at the earliest conceptual design phases in cold semi-arid climates.

Sign in / Sign up

Export Citation Format

Share Document